David Ahearn

I am very vagus but here goes.I understand that my grandfther David Ahearn was born in Co Waterford around 1860-70.He came to south shields in England and married Ellen callender around 1880-1890.They had Five children david, alice, William, john and Matthew(my father now deceased).Alice who is 93 is still living but very senile.I understand that david had a daughter called maureen who emigrated to the usa about 40 years ago.I would be grateful if anyone could help me trace my roots.